<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>注册页面</h1>
<div>
    <input type="text" placeholder="用户名" @blur="f()" v-model="user.username">{{info}}<br>
    <input type="text" placeholder="密码" v-model="user.password"><br>
    <input type="text" placeholder="昵称" v-model="user.nickname"><br>
    <input type="button" value="注册" @click="reg()">
</div>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
<script>
   let v = new Vue({
        el: "body>div",
        data:{
            user:{
                username:"",
                password:"",
                nickname:"",
            },
            info:""
        },
       methods:{
            reg(){
                //发请求
                axios.post("/reg",v.user).then(function (response){
                    if(response.data==1){
                        alert("注册成功!")//弹出
                        location.href="/";//返回首页
                    }else{
                        alert("用户名已存在!")
                    }

                })

            },
           f(){
                axios.get("/check?username="+v.user.username)
               .then(function (response){
                   v.info = response.data;
               })
               console.log("用户名:"+v.user.username);
           }

       }
    })
</script>
</body>
</html>